sphinx<7

Author: mmcky

environment.yml

@@ -6,7 +6,7 @@ dependencies:
   - anaconda=2025.06
   - pip
   - pip:
-    - sphinx<8
+    - sphinx<7 # python=3.13 is missing imgdhr used by epub3 builder and requires sphinx<=6.2
     - jupyter-book==1.0.3
     - quantecon-book-theme==0.8.1
     - sphinx-tojupyter==0.3.0